How do you say doing good in German?

Answer 1

In the sense of to do good, in the sense of to be beneficial or charity:

Wohltun, e.g.:

It does good you good to help people = Es tut wohl, Menschen zu helfen

In the sense of a reply to the question How are/is...?

doing good = geht es gut, e.g.:

I'm doing good = mir geht es gut